Custom White Balance on 40D

Hey everyone,
I'm a newbie here. Great forum.
I did some searching and could not find the answer. The instructions for the 40D states that setting the custom white balance, I photograph a white or 18% grey card in any preset white balance mode. Then import it with the CWB setting. So, as a test I photographed a grey card under all of the preset white balance modes and got a different tone of grey for each mode. Isn't the camera just importing the white balance for the mode I photographed the grey card in?
Thanks for the help

To set the custom white balance, you need a picture where the center section of the image is what you want to be white, or grey as a grey card.

No open the third item under the second menu tab (all this requires the camera to be in the creative zone, but that I guess you've figured out), select the image you want to be your reference for white and press SET, confirm (OK) by pressing SET again and finally acknowledge the instruction to set the camera to custom white balance with yet another SET.

Now go up one row in the same menu, open it and select the custom white balance (it's the second last, above the Kelvin setting).

Now with this setting, if you go and take a picture again of the same subject, the part you used as white balance reference will look white.

Selecting the custom white balance can also be done by pressing the metering/white balance button on top of the camera and then by looking in the top display, or (provided you've pressed INFO twice) by looking at the main screen.

Don't forget to redo your custom white balance for every different lighting.

Got it, Thanks for the help!